A program for the analysis of 3D steady-state groundwater flow, and the
advective transport of particles, including linear adsorption and desorption. The model
assumes flow in the aquifer to be mainly horizontal, with vertical flow from one aquifer
to another through the resistance layers. The model handles up to six layers. The aquifers
may be confined or unconfined, and may also be partly confined and partly unconfined.
The flow of groundwater may be influenced by various types of wells, line sources, line
drains and line screens (impermeable walls). The geometry of the problem can be
described in a two-dimensional network of triangular elements in the x,y-plane. The
model area is divided in to a number of triangular zones, each of which is homogeneous
with respect to soil properties (permeability, porosity and retardation factor) and
infiltration rate. Each of the zones is subdivided in a large number of triangular elements.
This refinement is automatically performed by the program based on user-defined
zone-refinement strategy. The particles, representing transport of
pollutants, can be traced both in a forwards mode (downstream direction) and a
backwards mode (upstream direction). Travel times can be marked on pathlines. It has a
text-based user interface for program control and data input and editing. Results of mesh
generation, head distribution and pathlines in 2D or 3D are displayed on screen or to a
HPGL plotfile.
Source: Geoenviromental Software Directory